Dual-head grinding drill machine and grinding method

ABSTRACT

A dual-head grinding drill machine and a grinding method that include two grinding bases on both ends of a motive power source and each having a grinding wheel. A fixing device separately aligns a left or a right drill or a mill, such that the knives into blade directions can perform a grinding operation on the same grinding machine. A pneumatic motor is installed to match with a sucking passage for discharging drill bits from the positions of two grinding wheels, so as to achieve an extensive applicability and an environmental protection effect. The multi-axis deflective and bias design of the grinding base provides a diversified grinding design for grinding a blade stationary point for different requirements and a blade belly with a different curvature.

CROSS-REFERENCES TO RELATED APPLICATIONS

The present invention is a continuation-in-part application of the co-pending U.S. application Ser. No. 11/078,346, filed on Mar. 14, 2005.

FIELD OF THE INVENTION

The present invention relates to a dual-head grinding drill machine and a grinding method, and more particularly to a grinding machine having two heads for simultaneously grinding a left blade and a right blade of a drill or other knife, and a grinding base having a multi-axis deflection to meet different requirements.

BACKGROUND OF THE INVENTION

U.S. Pat. No. 6,517,411 discloses a design of a grinding machine having two grinding wheels, but such machine is a large machine which is not portable, and the two grinding wheels are driven by different motive power sources, and thus causing inconvenience for their use and wasting energy. Further, a small change of the grinding angle is allowed by adjusting the length of the grinding wheel, but the grinding cannot carry out the grinding process by the left and right rotating blades, and the grind process relies on an operator's personal skill, or else an error will result easily. Thus, the grinding machines of this sort require further improvements.

U.S. patent Ser. No. 10/883,856 filed by the inventor of the present invention discloses a structure of a portable grinding drill machine having a grinding wheel driven by a motive power source, but such grinding drill machine still has limited functions for the grinding by a single blade only and cannot meet the requirements of the full utility of the grinding machine.

SUMMARY OF THE INVENTION

In view of the shortcomings of the prior art, the inventor of the invention developed a dual-head grinding drill machine and a grinding method in accordance with the invention, wherein the grinding machine is a portable structure that comes with a design applicable for the blades of left and right knives and provides a more effective way to collect and recycle drill bits and a higher power efficiency, so that the grinding process can meet the practical requirements.

The primary objective of the present invention is to provide a dual-head grinding drill machine and a grinding method that comprise two grinding wheels disposed on both sides of a motive power source, and each grinding wheel includes a first grinding base with a multiple-axis deflection grounding edge and a grinding acute-angled stationary point, and a seconding grinding base with a stationary point of variable depths, so that the whole grinding machine can perform a manufacturing process by a left rotary or right rotary bladed drill or knife and the motive power source could be a pneumatic power having a design of a sucking passage to facilitate a compulsory elimination of drill bits for the grinding wheel, so as to achieve the environmental protection requirements. With the design of the first grinding base with a multiple-axis deflection and the second grinding base with an adjustable position, the invention can be used to fit different requirements and extensively used in different areas.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will now be described in more detail hereinafter with reference to the accompanying drawings that show various embodiments of the invention, in which:

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic view of opening a hood according to the present invention;

FIG. 3 is an exploded view of a whole system of the present invention;

FIG. 4 is an enlarged view of a second grinding base of the present invention;

FIG. 5 is an enlarged view of a fixing device of the present invention;

FIG. 6 is a schematic view of the design of a single-head grinding base of the present invention;

FIG. 7-1 shows a front plane view of the ground object which is located corresponding to the axial points of the shifting axle;

FIG. 7-2 shows a top plane view of the ground object which is located corresponding to the axial points of the shifting axle;

FIG. 7-3 shows a side plane view of the ground object which is located corresponding to the axial points of the shifting axle;

FIG. 8-1 shows the front view of the ground object;

FIG. 8-2 shows the top view of the ground object;

FIG. 9 shows the ground object of FIG. 8-1;

FIG. 10 is a top view to show that the pivoting point of the base member shifts;

FIG. 11 shows the deviating member and the bias rotary member, and

FIG. 12 shows a top view of the combination of the the deviating member and the bias rotary member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

To make it easier for our examiner to understand the structure, innovative features and other objectives of the present invention, the invention will now be described in more detail hereinafter with reference to the accompanying drawings that show various embodiments of the invention. However, the drawings are provided for illustrating the preferred embodiments and not intended for limiting the scope of the invention.

Referring to FIGS. 1 to 3, the invention comprises a base 100, a motive power source 10 disposed on the base 100, and both ends of the motive power source 10 are extended to both ends of the motive power axle 11 and passed and fixed to a support member 12 on the base 100, two grinding wheels 13, a heat dissipating vane 14 disposed at an external side of the grinding wheel 13 for providing a heat dissipation while performing the grinding operation, and a hood 15 pivotally coupled to both sides of the base 100 for covering the grinding wheels 13.

The hood 15 includes a first grinding base 20 and a second grinding base 30 disposed at the front side and the top side of the hood 15, and a clamping tool 40 for clamping a ground object 99 to cope with the operations of the first grinding base 20 and the second grinding base 30. The front distal surface of the base 100 includes a plurality of fixing devices 50 for fixing the ground object 99 clamped by the clamping tool 40 and maintaining the best position to be fixed with the clamping tool 40, so that the overall operation can meet the grinding drill or other knife requirements for the blade edges of the ground object 99.

The first grinding base 20 includes a base member 21, a curved sliding groove 210 disposed at the bottom of the base member 21 for securing a fixing bolt onto the base 100, a pivot portion 211 formed at the bottom of the base member 21 for passing and fixing a pivot onto the base 100 and allowing the base member 21 to use the pivot as a deflection center.

The base member 21 includes a bias rotary base 22 pivotally coupled to a perpendicular wall of the base member 21 and two fixing pillars 220 disposed on a perpendicular surface of the rotary base 22 for latching the clamping tool 40, such that the clamping tool 40 and the rotary base 22 can be rotated as a whole, and the rotary base 22 includes a flat and straight limit portion 221 corresponding to the perpendicular wall of the base member 21, and two limit pillars 212 disposed on the base member 21, so as to limit the rotary base 22 and the clamping tool 40 as well as the angle of deflection when the ground object 99 is ground at the first grinding base 20.

The second grinding base 30 includes a base member 31 fixed onto the support member 12 as shown in FIG. 4, and an end of the base member 31 is pivotally coupled to the support member 12 by a pivot 32, and another end of the base member 31 includes a fixing bolt 33 and a central axle of a cam control button 34 that passes through the support member 12, wherein the fixing bolt 33 is screwed onto the base member 31, and the central axle of the control button 34 controls a cam type propping member 35 for propping the bottom of the base member 31, such that the base member 31 can change its inclination to achieve the different cutting requirements.

The clamping tool 40 includes a clamping member 41 and a compressing member 42 screwed onto the clamping member 41, and the clamping member 41 includes an elastic cylindrical clamp structure therein, and the exterior of the clamping member 41 is screwed with the compressing member 42 and includes a plug-unplug structure such that when the compressing member 42 is secured onto the clamping member 41, a clamping action is produced onto the ground object 99 in the clamping member 41, and an end of the clamping member 41 forms a sheathing portion 410 with a smaller diameter to collocate with the first and second grinding bases 20, 30, and an end of the sheathing portion 410 with a larger diameter forms a flat and straight limit portion 411 for limiting the position of each grinding base 20, 30 and the limit pillar on the fixing device. The quantity of the limit portions 411 is set according to the quantity of blades of the ground object 99 such as a drill.

Referring to FIG. 5, the fixing device 50 includes a transversally laid L-shape base member 51, a receiving portion 510 in the form of a through hole disposed at the front end of the base member 51, and a limit pillar 511 disposed at an external edge of the receiving portion 510 for latching and fixing the limit portion 411 on the clamping member 41, and a horizontal position at another end of the base member 51 includes a cylindrical seat 52, and the seat 52 includes a hollow for installing a resilient member 53 in the form of a loop spring and a fixing base 54 disposed at the top of the seat 52, and the bottom of the fixing base 54 includes a sunken limit portion 540 corresponding to the seat 52, and the middle of the fixing base 54 includes a screw-type fixing member 55 with its central axle portion passing and fixing into the bottom of the hollow of the seat 52 by a thread end of the central axle of the fixing member 55, such that the fixing member 55 can compress and fix the fixing base 54 to the top of the seat 52, and the periphery of the fixing base 54 and the blade at the tip of the ground object 99 correspond to the fixing portion 541. In this preferred embodiment, there are four surfaces with different inclinations, and thus the invention has a total of two fixing devices 50, each having a fixing base 54 with four fixing portions 541 of different inclination, so that the structure of the invention fits the blades of more than eight different kinds of ground objects 99.

Further, the space at the bottom of the base 100 includes a large drawer-type object containing member 60, and the object containing member 60 includes a rack 61 therein for placing the clamping tools that clamp different ground objects 99.

The motive power source 10 of the invention could be a general electric motor, or a wind power motor as shown in FIG. 3, and an end of the wind power motor is an air incoming end 101 and the other end is an air outgoing end 102, and a sucking passage 103 is extended from the wind power motor on the base 100, and an opening of the sucking passage 103 is disposed at two grinding wheels 13, such that when the motive power source 10 is turned on, the sucking passage 103 forms a negative pressure to suck the drill bits remained after a grinding process by the grinding wheel 13 through the sucking passage 103, and the air outgoing end 102 of the motive power source 10 discharges the drill bits into a collector, so that the waste bits will not leak into the air. Therefore, the invention can meet the environmental protection requirements.

The rotary base 22 installed at the base member 21 of the first grinding base 20 corresponds to the structure as shown in FIG. 7, and the bias center and deflection of the bias rotary base 22 pivotally coupled to a perpendicular wall of the base member 21 form a multi-axial deflection mode. The perpendicular wall of the base member 21 includes a rotary base installing portion 213 in the form of a hole, and the rotary base 22 includes a tool installing portion 222 in the form of a hole disposed at the position of the clamping tool 40, and the axle center of the ground object at the center of the clamping tool 40 in contact with the surface of the grinding wheel 13 is a cutting center C, and the projected point of the cutting center C projected onto a perpendicular surface of the base member 21 is a horizontal axial point C′, and the center of the tool installing portion 222 is shifted by the horizontal axial point C′ downward to form a bias axial point A. If the base member 21 is rotated on the rotary base 22 to drive the clamping tool 40 and the ground object 99, the tip of the axle center of the ground object 99 will be fixed motionlessly at the cutting center C, and the tip and peripheral surface of the ground object 99 will go around the horizontal axial point C′ along the bias axial point A for approximately 90 degrees to a grinding deviation B to produce cutting and grinding effects. In the present invention, the rotary base installing portion 213 of the base member 21 further includes a horizontal offset axial point A′ which is in the form of a slanting hole for aligning the first shifting axle CA′ of the base member 21 of the rotary base 22 at a shifting angle from −10 to 10 degrees with respect to the reference axis CC′, and aligning the second shifting axle CA of tool installing portion 222 of the rotary base 22 at 0 to −5 degrees with respect to the reference axis, such that the rotary base 22 rotates on the base member 21 in a grinding process, the clamping tool 40 and the ground object 99 shift the first shifting axle CA′ and the second shifting axle CA by using the reference axis CC′ as the center, and thus the periphery and the tip of the ground object 99 form different curvatures and cambered surfaces by two different shifting axles moving at the same time.

Referring to FIG. 8, a stationary point 990 is disposed at the center of the tip of the ground object 99 that forms two straight blade edge 991 depending on the required quantity of blade edges, and the blade edge 991 is extended towards a curved blade belly 992 along the direction of the left or right rotary knife, and the end of the blade belly 992 forms a steep-angled bevel 993, and a bits removing tank 994 is disposed behind a bevel 993, and a slanting stationary point slot 995 is formed at the bevel 993 extended to the stationary point 990, wherein the first grinding base 20 is provided for grinding the blade edge 991 and the blade belly 992, and the second grinding base 30 is provided for grinding the bevel 993 and the stationary point slot 995. If two shifting axles are used for grinding according to the invention, the two shifting axles are compared with curve BA of the first belly of the second shifting axle CA only. The second belly curve A′B′ ground by the two shifting axles will be quicker and maintain motionless at the stationary point 990 of the ground object 99 and the cutting center C in a non-proportional manner, and only the blade belly 992 portion is cut. In the preferred embodiment as shown in the figures, the first shifting axle CA′ and the shift of the reference axis CC′ shift about 0 to 10 degrees. In other words, when the first shifting axle CA′ shifts, the blade belly 992 leans towards the surface of the grinding wheel 13 quickly to form a larger slanting curvature of the blade belly 992, and the support of the blade edge 991 is decreased, and the strength of the blade edge 991 is decreased. If the surface of a softer work piece is milled and the angle of the first shifting axle CA′ with respect to the reference axis CC′ is negative, then the grinding quantity of the blade belly 992 will be decreased and the slanting curvature becomes flat, and the support of the blade edge 991 becomes larger, and thus the ground object 99 and the work piece can stand larger milling force, which is suitable for grinding the surface of a harder work piece.

In the invention, the rotary base installing portion 213 on the base member 21 further comprises a horizontal offset axial point A′ which is in the form of a slanting hole, so that the first shifting axle CA′ of the rotary base 22 on the base member 21 is the same as the first preferred embodiment of the present invention. In FIG. 10, the pivot portion 211 at the bottom of the base member 21 is provided for passing and fixing a pivot into the pivoting point 211A of the base 100 according to the foregoing shifting angle at the shifting axle point A′ for a compensatory displacement that is shifted to the pivoting point 211B, 211C, and the rotary base installing portion 213 on the base member 21 maintains perpendicular to the perpendicular portion of the base member 21 and not in the form of a slanting hole, so as to achieve the aforementioned effect of enhancing the cutting function. With the same design, another deviating member 23 is installed between the base member 21 and the rotary base 22 or between the rotary base 22 and the clamping tool 40 to achieve the same effect. Taking the clamping tool 40 installed at the deviating member 23 and the rotary base 22 for example, the clamping tool 40 is installed into the deviating member 23 and placed into the receiving portion 230, and the exterior forms a sheathing portion 231 having a flange with a large diameter at an end and a small diameter at the other end, wherein the hole position of the sheathing portion 231 is concentric with the center of the rotary base 22, and the receiving portion 230 can be designed as a slanting hole according to the differences of a slope and a position at the shifting axle point A′, so as to change the position of the center for passing through the ground object 99 and achieve the multi-axis grinding effect. The receiving portion 230 can be installed at the bias center position of the sheathing portion 231 according to the length of the blade belly 992 as shown in FIG. 12 for grinding the ground object 99 that has blade edges 991 with different lengths on both sides.

Another characteristic of the present invention resides on that a back grinding side 130 of the grinding wheel 13 is in the form of an inwardly slanting acute angle substantially maintaining an angle from 0 degree to 5 degrees with a parallel line on the backside of the grinding wheel 13, so that when the ground object 99 carries out a cutting process on the second grinding base 30, a stationary point slot 995 formed on a slide of the blade edge 991 proximate to the stationary point 990 is not perpendicular to the blade edge 991 and has an inwardly slanting angle from 0 degree to 5 degrees from the vertical direction, so as to reduce or eliminate any obstruction to the drill bits eliminating function.

In the present invention, both ends of the motive power source 10 correspond to the first and second grinding bases 20, 30, and also correspond to another group of first and second grinding bases 20, 30 as shown in FIG. 6, so that both heads of the grinding machine have four grounds of different grinding bases 20, 30 each to cope with different grinding requirements.

In summation of the above description, the present invention herein enhances the performance than the conventional structure and further complies with the patent application requirements 

1. A dual-head grinding drill machine and a grinding method, comprising: a motive power source, installed on a base; two grinding wheels, installed at both ends of a motive power axle that are extended from both ends of said motive power source; a hood, pivotally coupled to both sides of said base; at least one group of a first grinding base and a second grinding base disposed on both ends of said grinding base and corresponding to said grinding wheel; a clamping tool, for clamping a ground object and corresponding to the operations of said first grinding base and said second grinding base; and at least one fixing device installed at a front distal surface of said base.
 2. The dual-head grinding drill machine and grinding method of claim 1, wherein said first grinding base includes a base member, a sliding groove disposed at the bottom of said base member, a pivot portion formed on another end of the bottom of said base member for passing and fixing a pivot onto said base, such that said base member uses said pivot as the center of a deflection, and a perpendicular wall of said base member is pivotally coupled to a bias rotary base, and a perpendicular surface of said rotary base includes a fixing pillar latched with said clamping tool, and said rotary base includes a limit portion disposed on a perpendicular wall of said base member, and said base member includes a corresponding limit pillar.
 3. The dual-head grinding drill machine and grinding method of claim 1, wherein said rotary base of said base member of said first grinding base has a bias center and a bias axle in the form of a multi-axial mode with said bias rotary base pivotally coupled to a perpendicular wall of said base member, such that the perpendicular wall of said base member includes a rotary base installing portion, and said rotary base includes a tool installing portion disposed at a position of said clamping tool, and a point of said ground object axle center at the center of said clamping tool in contact with the surface of said grinding wheel is a cutting center C, and said cutting center C is projected onto a projected point of a horizontal axial point C′ on a perpendicular surface of said base member, and the center of said tool installing portion shifts from said horizontal axial point C′ downward to said bias axial point A, such that when said base member rotates on said rotary base to drive said clamping tool and said ground object, the tip of said ground object axle center is fixed motionless at said cutting center C, and the tip and peripheral surface of said ground object go around said horizontal axial point C′ along said bias axial point A for approximately 90 degrees to a grinding shift position for producing a cutting and a grinding effects, and said rotary base installing portion of said base member includes a horizontal offset axial point A′ in the form of a slanting hole, such that said first shifting axle CA′ of said base member of said rotary base aligns at a shifting angle from −10 to 10 degrees with respect to a reference axis CC′, and said second shifting axle CA of said tool installing portion of said rotary base aligns at a shifting angle from 0 to −5 degrees with respect to said reference axis CC′, such that when said rotary base rotates on said base member in a grinding process, said clamping tool and said ground object shift by using said reference axis CC′ as a center according to a predetermined offset of said first shifting axle CA′ and said second shifting axle CA predetermined offset, so that the periphery at the tip of said ground object form different curvature and cambered surface by two different shifting axles moving at the same time.
 4. The dual-head grinding drill machine and grinding method of claims 1 or 3, wherein said ground object includes a stationary point at the tip of the center of said ground object, and said stationary point forms two straight blade edges according to the required quantity of said blade edges, and a curved blade belly extended from said blade edge towards a left or a right rotary knife forms a bevel with a slanting angle disposed at an end of said blade belly, and a bits removing tank is disposed behind said bevel, and said bevel forms a slanting stationary point slot disposed at a position of said bevel being extended to said stationary point, and said first grinding base grinds said blade edge and said blade belly, and said second grinding base grinds said bevel and said stationary point slot, such that when two shifting axles are used for grinding, a curve BA of said first bell cut by said second shifting axle CA is compared with a curve A′B′ of said second belly ground by said two shifting axles, and thus the process of rotating said ground object becomes fasters in a non-proportional way and maintains motionless at said ground object stationary point and said cutting center C, and only the portion of said blade belly is cut, and if said first shifting axle CA′ shifts within an angle from 0 to 10 degrees with respect to said reference axis CC′, then said blade belly is driven to move quickly towards the surface of said grinding wheel for a deeper grinding to form a larger slanting curvature of said blade belly, such that when said ground object mills the surface of said work piece, the hardness of said blade will be lower to cope with the process of grinding a softer work piece.
 5. The dual-head grinding drill machine and grinding method of claim 4, wherein if said first shifting axle CA′ is aligned at a negative angle with said reference axis CC′, the grinding of said blade belly is reduced and the slope and curvature of said blade belly becomes flat, and the strength of said blade becomes stronger when said ground object and said work piece is drilled to fit the process of grinding the surface of a harder work piece.
 6. The dual-head grinding drill machine and grinding method of claim 1, wherein said pivot portion at the bottom of said base member is provided for passing said pivot through and fixed to a pivoting point according to a deviated angle at a deviating axial point A′ for a deviated displacement and deviating said pivot to said pivoting point, and said rotary base installing portion of said base member is maintained perpendicular to a vertical portion of said base member.
 7. The dual-head grinding drill machine and grinding method of claim 1, further comprising a deviating member disposed between said base member and said rotary base or between said rotary base and said clamping tool.
 8. The dual-head grinding drill machine and grinding method of claim 7, wherein said deviating member is installed between said clamping tool and said rotary base, and said deviating member includes a receiving portion for placing said clamping tool, and a sheathing portion having a flange of a larger diameter at one end and another end with a smaller diameter, and the hole position of said sheathing portion and the center of said rotary base are concentric, and said receiving portion is installed as a slanting hole according to the slope difference at a shifting axle point A′ to change the position of a center for passing another ground object.
 9. The dual-head grinding drill machine and grinding method of claim 8, wherein said receiving portion of said deviating member can be installed at the bias position of said sheathing portion according to the lengths of said blades for performing a grinding process for the blades with different lengths on both sides.
 10. The dual-head grinding drill machine and grinding method of claim 1, wherein said second grinding base is fixed onto said base member of said base, and an end of said base member is pivotally coupled to said base by a pivot, and another end of said base member includes a corresponding fixing bolt and a central axle of a cam control button passes through said base, and said fixing bolt is secured onto said base member, and a central axle of said control button controls a propping member.
 11. The dual-head grinding drill machine and grinding method of claim 10, wherein said central axle of said control button is a cam structure to cope with the control of a propping member.
 12. The dual-head grinding drill machine and grinding method of claim 10, wherein said base corresponding to said second grinding base includes a support member disposed perpendicular to the bottom of said base.
 13. The dual-head grinding drill machine and grinding method of claim 1, wherein said clamping tool includes a clamping member and a compressing member screwed onto said clamping member, and said clamping member includes an elastic cylindrical structure therein, and the exterior of said clamping member is screwed with said compressing member, and a plug-unplug structure is provided such that when said compressing member is screwed onto said clamping member, a clamping action is produced for clamping said ground member in said ground object.
 14. The dual-head grinding drill machine and grinding method of claim 13, wherein said clamping member includes a sheathing portion with a small diameter formed at an end and corresponding to said first and second grinding bases, and an end of said sheathing portion with a large diameter forms a limit portion.
 15. The dual-head grinding drill machine and grinding method of claim 14, wherein said limit portion comes with a quantity according to the quantity of blades of said ground object such as a drill.
 16. The dual-head grinding drill machine and grinding method of claim 1, wherein said fixing device comprises a flat base member, a receiving portion disposed at an end of said base member, and a limit pillar disposed at an external edge of said receiving portion, and said base member comprises a cylindrical seat disposed at another end of said base member for receiving a resilient member, a fixing base disposed proximate to the top of said seat, and a limit portion disposed at the bottom of said fixing base and corresponding to said seat, and a fixing member being passed through the center of an axle and secured into the bottom of a hollow interior of said seat, and a fixing portion formed at a cut position corresponding to the periphery of said fixing base and the tip of said ground object.
 17. The dual-head grinding drill machine and grinding method of claim 16, wherein said fixing portion of said fixing base forms a plurality of surfaces with different slopes to cope with the structure.
 18. The dual-head grinding drill machine and grinding method of claim 1, wherein said space at the bottom of said base has a larger area for installing an object containing rack in the form of an object containing member having a large drawer.
 19. The dual-head grinding drill machine and grinding method of claim 1, wherein said motive power source is a motor, and said motor is a wind power motor having an end as an air incoming end and the other end as an air outgoing end.
 20. The dual-head grinding drill machine and grinding method of claim 19, wherein said base includes a sucking passage extended from said wind power motor and an opening of said sucking passage is disposed separately at said two grinding wheels.
 21. The dual-head grinding drill machine and grinding method of claim 1, wherein said rear grinding surface of said grinding wheel constitutes an inwardly tilted acute angle and substantially maintain an angle from 0 degree to 5 degrees with a horizontal line. 